Metal-drawing apparatus



F. J. OBRIEN.

METAL DRAWING APPARM'USl APPLICATION man MM? 5, 1919.

l ,34 ,664, Patented June 1, '1920.

F. I. ofBIIIEN.

METAL DRAWING APPARATUS.

APPLICATION FILED MM5. 1919.

1,341,664. Patemedune 1,1920.

2 SHEETS-SHEET 2.

I 'fg FRANK J. OBRIEN, OF MILWAUKEE, WISCONSIN.

METAL-DRAWING APPARATUS.

Application led May 5,

To all whom it may concern.'

Be it known that I, FRANK J. OBRIEN, a

citizen of the United States, residing at` object to provide a new and improved ap paratus especially adapted for use in coldy drawing of pipe lor the like to return the drawing member or carriage to the die member at the conclusion of the drawingl operation.

rThese and other obj ects will be more fully explained and described in' the following specification and shown in' the accompanying drawings, in which`v Figure l is a side elevation 'of my apparatus; Y f

Fig. 2 is a. side elevation of the retrieving member; and Y Fig. 3 is a Vertical section through the retrieving member along the line 3 3 of Fig. 2. l

Like numerals refer to like elements throughout the drawings, in which 10 designates generally thel bench upon which is mounted a channel-shaped member 11 having the raised sides 11 between which runs the endless chain 12. This chain runs over a pulley 13 at one end and a sprocket pulley lei at the other end, the latter being actuated by a suitable shaft 14a and driven gear 15.

lMounted upon the channel member 11 is what I term generally the carriage member 20 having suitable wheels or rollers 20, which ride upon the sides 11a of the channel member 11, thereby reducing friction in the movement of the carriage member 20. The latter is of well known construction and needs no detailed description beyond the statement that at its forward end, as indicated at 20", is provided a plier portion whdich is utilized to grip the end base of the tube or metal A which is being drawn. This carriage member is further provided with a pivotally mounted-hook 20, which may be dropped into engagement with the chain 12 when it is desired to start the drawing operation.

Located at one end of the channel member 11 is a die, generally indicated by the numeral 25, comprising a conventional form of Specification of Letters Patent.

Patented June 1, 19220.

1919. Serial No. 294,813.

die, and where needed a mandrel, neither of which elements is shown since they per se do not form a part of this invention.

Mounted upon the die member 25 is a retrieving member, generally indicated by the numeral 30, provided with a base 30at which is secured by cap screws 31, or the like, to the top of the vdie member 25. Extending upwardly from the base 30a are the side plates 30b in which is journaled the rotatable shaft 30C, to which is secured the drum 30d provided with a peripheral recess 30e, upon which the cable 32 is wound. 'The drum is further provided with the shoulder 30f, eoacting with a brake band 30g, see Fig. 3 for example, which merely surrounds the shoulder ,302 and which terminates at one end in the upstanding flange 30g', and at the other end in an upstanding portion 30h. An operating handle 311: is pivoted at 34a to a cross-strap 35 and at its lower portion at 341 to the upstanding portion'30h ofthe brake band. The strap 35 extends through a guide or brace 36 which extends between brackets 40 and is secured thereto andy is provided with a threaded portion 35a which extends through the flange 30g, being prevented from withdrawal by the adjustable nut 35h. A coil spring 37 is located around the portion 35a between the flange 30g and guide 36. y

This construction, through the medium of the spring 37, normally maintains the brake band out of engagement with theshoulder 30f. It will be seen that upon proper movement of the operating handle 34, the up standing portion 3011 and the flange 30g will be drawn toward each other against the action of the coil spring 37, and the brake band will be tightened upon the shoulder 30f.

Adjacent the shoulder 30f, the drum 30b is provided with teeth 30k with which coacts the pivoted bell crank 38, having the dog portion 38, said crank being rotatably mounted on a shaft 39 which extends between the brackets 4,0, projecting upwardly from and secured to the side plates 30". The bell crank 38 terminates in the weighted ball-shaped extremity 38h, which serves to maintain the dog portion 382L in engagement with the toothed periphery 30k of the drum 30d when in the position shown in Fig. 2, for example. This construction permits unwinding of the drum 30d, but prevents its rewinding except when the bell crank 38 is thrown out of engagement. Each of the side plates 30b is rece'ssed, as indicated by the numeral 30m, and mounted in these recesses are the spiral springs 4:2, secured at one end to the peripheral wall of the recess 30m and at their other ends to the hub 30 of the drum 30d, said hub being mounted upon and secured to the shaft 30C. The construction and arrangement of these springs 42 are such that unwinding' of the drum 30L would serve to compress or store energy in these springs. The cable 32 is secured at its free end tothe front of the carriage member 20, as indicated by 20e, Fig. 1.

In the operation of my apparatus, after the end of thetube A or the like is reached and passed through the die it is seized by the plier portion 2Gb of the carriage member 20, andthe operator moves the hook 2Oc into engagement with the endless moving chain l2, which draws the tube through the die 25 until the conclusion of the drawing operation.

when the drawing member 20 is disengaged from the chain 12. The operator may then operate the brake lever 30 to holdthe drum 30d in position and then move the bell crank 38 out of engagement with the toothed portion 30h of the drimi. Thereafter, upon proper release of the brake lever 34, the stored energy of the springs 42 will rewind the cable 32 upon the drum 30d, thereby returning the carriage member 20 to the die member for a fresh drawing operation. The speed of this return movement may be regulated by proper actuation of the brake lever 34.

It will be obvious that my invention is susceptible of numerous modifications and improvements, and I do not wish to be restricted to the form shown except as delined in the appended claims.

What I claim is:

l. In combination, a drawing member, a diel carrying member, a retrieving member, said retrieving, member comprising a drum, a flexible member carried on said drum and attached to said drawing member, and spring means coacting with said drum to store energy during the movement of said drawing member away from said die carrying member and operably returning said drawing member to said die member at the conclusion of said drawing movement.

2. In mechanism of the class described, a stationary die-carrying member, retrieving means mounted thereon and comprising a reel, an actuating spring coacting therewith, and means to permit rotation of said reel in one direction and to prevent rotation in the other.

8. Inmechanism of the class described, a stationary die-carrying member, retrieving means mounted thereon and comprising a reel, an actuating spring coacting therewith, means to permit rotation of said reel in one direction and to prevent rotation in the other, said last-named means comprising a pawl carried by said reel, and a pivoted coacting dog member.

4. In mechanism of the class described, a stationary die-carrying member, retrieving means mounted thereon and comprising a reel, an actuating spring coacting therewith, mean's to permit rotation of said reel in one direction and to prevent rotation in the other, and manually operable brake mechanism coactable with said reel.

AIn testimony whereof I have subscribed my name.

FRANK J. OBRIEN 

